Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
nhan luc » nang luc
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
van anh » tuan anh, van minh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty dang xay hoi. hieu va nhan luc ((van anh) OR (van thanh)) va ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty dang xay hoi. hieu va nhan luc ((van anh) OR (van thanh)) va ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty dang xay hoi. hieu va nhan luc ((van anh) OR (van thanh)) va ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ty dang xay hoi. hieu va nhan luc ((van anh) OR (van thanh)) va ((cua tre) or (su triet))*.